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Fungal Taxa Target Different Carbon Sources in Forest Soil

机译:真菌类群针对森林土壤中不同碳源

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摘要

Soil microbes are among the most abundant and diverse organisms on Earth. Although microbial decomposers, particularly fungi, are important mediators of global carbon and nutrient cycling, the functional roles of specific taxa within natural environments remain unclear. We used a nucleotide-analog technique in soils from the Harvard Forest to characterize the fungal taxa that responded to the addition of five different carbon substrates--glycine, sucrose, cellulose, lignin, and tannin-protein. We show that fungal community structure and richness shift in response to different carbon sources, and we demonstrate that particular fungal taxa target different organic compounds within soil microcosms. Specifically, we identified eleven taxa that exhibited changes in relative abundances across substrate treatments. These results imply that niche partitioning through specialized resource use may be an important mechanism by which soil microbial diversity is maintained in ecosystems. Consequently, high microbial diversity may be necessary to sustain ecosystem processes and stability under global change.
机译:土壤微生物是地球上最丰富多样的生物之一。尽管微生物分解剂,特别是真菌,是全球碳和养分循环的重要媒介,但具体分类单元在自然环境中的功能作用仍不清楚。我们在哈佛森林的土壤中使用了核苷酸类似物技术来表征真菌分类群,该分类群对添加五种不同的碳底物-甘氨酸,蔗糖,纤维素,木质素和单宁蛋白做出了响应。我们表明真菌群落结构和丰富度响应不同的碳源转移,并且我们证明特定的真菌类群针对土壤微观世界中的不同有机化合物。具体而言,我们确定了11种在整个底物处理过程中相对丰度均发生变化的分类单元。这些结果表明,通过专门资源的利用来对生态位进行分区可能是维持生态系统中土壤微生物多样性的重要机制。因此,可能需要高微生物多样性来维持全球变化下的生态系统过程和稳定性。

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